I have recently found this 2018 "P" Jefferson Nickel reverse IDB near the designers initials. It reminds me of the "IBE" error on a lincoln cent. I have submitted it to Cuds on Coins so we will see how that goes.
Thought at first you said in your original post it was a cud. Now I see you just said you submitted it to Cuds on coins. I was confused for a second.